Biogas potential assessment from beer and sugar producing factories waste
2016
Dubrovskis, V., Latvia Univ. of Agriculture, Jelgava (Latvia) | Plume, I., Latvia Univ. of Agriculture, Jelgava (Latvia)
Sugar-beet sugar factories processing residue (molasses) and beer factory wastes (beer wort) were investigated for methane potential and degree of biodegradation. The experiment was conducted in 16 laboratory bioreactors (volume 0.075 l) in batch mode at a temperature of 38 ºC during a 43-day anaerobic fermentation period. The investigated biodegradation rate of dry organic matter of molasses and beer wort were 97.98 % and 92.37 %, respectively. Average specific biogas yield was 969 ± 50 l·kgE-1 DOM (534 ± 30 l·kgE-1 DOM methane) from molasses and 1255 ± 140 l·kgE-1 DOM biogas (726 ± 80 l·kgE-1 DOM methane) from beer wort. Average methane content in biogas obtained from molasses and beer wort was 55.21 ± 2.14 % and 57.91 ± 1.36 %, respectively. Biodegradation rates of organic matter of molasses and beer wort were 97.9 % and 92.4 % respectively during the anaerobic fermentation process. The study showed that significant amounts of methane can be obtained from molasses and beer wort in an anaerobic fermentation process.
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